2026 ICD-10-CM Diagnosis Code Z46.51Encounter for fitting and adjustment of gastric lap band

ICD-10-CM Codes›Z00–Z99›Z40-Z53›Z46

ICD-10-CM Z46.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z46.51 is a billable ICD-10-CM diagnosis code for encounter for fitting and adjustment of gastric lap band. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z46.51
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for fitting and adjustment of gastric lap band
Short Description
Encounter for fitting and adjustment of gastric lap band
Same as the full description in the CMS dataset.
Parent Code
Z46.5
Encounter for fitting and adjustment of other gastrointestinal appliance and device

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ40-Z53Encounters for other specific health care
CategoryZ46Encounter for fitting and adjustment of other devices
This CodeZ46.51Encounter for fitting and adjustment of gastric lap band

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z46.51.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z46.51 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Fitting(and adjustment) (of)
      • gastric lap band

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z46.51 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V53.51 Fit/adj gastric lap band
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z46.51Overview

Is Z46.51 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for fitting and adjustment of gastric lap band on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Z46.51 group to?

On inpatient claims, encounter for fitting and adjustment of gastric lap band maps to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

Can Z46.51 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for fitting and adjustment of gastric lap band describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z46.51 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for encounter for fitting and adjustment of gastric lap band on inpatient claims.

What is the ICD-9 equivalent of Z46.51?

Under the General Equivalence Mappings, encounter for fitting and adjustment of gastric lap band converts to ICD-9-CM V53.51 (fit/adj gastric lap band). The mapping is a direct match.